Sodium perborate containing borax and method of producing same.



FERDINAND FRITSCHE, F RUMBURG, AUSTRIA-HUNGARY, ASSIGNOR TO-THE F-IRMOF.

STOLLE AN-D KOPKE; OF RUMBURG, AUSTRZIAHUNGARY.

SODIUM PERBORATE-CONTAIN1N61BQBAX:.

. xenon: rnonuomms Sp ecifleation of Letters Patent:

1 atented-Nov. 17,- ices.

Application mee lanuary 18, 1908. Serial No. 410,860. (Specimen) Toallwhom it may concem:

Be it known that I, FERDINAND Fnrrscma, a subject of the Emperor ofAustria-v Hungary, and resident of'Rumburg, in the Empire ofAustria-Hungary, merchant, have invented a new and useful SodiumPerborate Containing Borax and Method of Producing the Same, of whichthefollowing is an exact specification.

The present invention relates to the production of a substancecontaining easily liberated oxygen and the improved substance according.to the present invention is a perborate ofsodium containing borax.

In Jauberts British specification No.

- 21387 of 1904 there is described a method of producing a boron andsodium compound from which oxygen is easily liberated which consists inmixing boric acid and sodium peroxid in the proportions of four molecules of the former to one of the latter. The following reaction takesplace in this case The crystallized perborate containing bo-' 2(NaBO-i-4H O) possesses 4.6% of free oxygen, that is to say 15% more than theproduct according to Jaubert.

and

Another known method of producing an oxygen yielding substance with theformula NaBO 4H O is to mix equal quantities of peroxid of sodium andboric acid. In this case the sodium not necessary for forming acid..According to thepresent process-the exact quantity of'boric acidnecessary for forming borax is used and in consequence the process isrendered simpler and cheaper. Perborates are principally employed in thetextile industry and the additional borax simultaneously producedaccording to the present invention does no harm. -Moreover even the pureperborate leaves boraxafter it has 'ven ofi' its oxygen. The productionof per orate according to my process however, has one very essentialeconomical advantage because it enables me to agaln employ the lyeremaining after each crystallization of the mixture of perborate andborax as part, of the water employed for treating the next lot of boricacid and peroxid and in this way the quantity. of water required for myprocess is very small in comparison with other proceedings.

In order to make my invention better understood I shall proceed toexplain by way of example how it may. be carried out 1n practice.

To 120 kilo ams of water 25 kllograms of boric aci are added whilestirring and the mixture is cooled down to .0". C. In this cooledmixture 10 kilograms of peroxid of sodium (92 per cent of N p.) are thengradually added in small portions and care must be taken to cool themixture so that the temperature of reaction does not rise above 30 C.-Shortl after the solution of the peroxid of sod the perborate is takenup by the mineral ium the crystallization begins, the mass is thencooled and temperature of about 30 C. The output of.

crystals in such a case amounts to 43 kilograms. The lye taken off andregained amounts to 80 kilograms which by addition of water is broughtup. to 120 kilograms and is used again as described above for treatingthe next lot of boric acid and peroxid. In these succeeding operationsthe output in crystallined substance and lye remains constantthroughout.

The product of. the above process is a white crystalline mass which maybe sold in the form of a. powder and its chief use in the art is as anoxygen carrier. It is non poisonous and when used in bleaching theresidue left after treatment is also a harmless and non-poisonoussubstance.

I claim 1. The process of producing perborate-of sodium containing boraxconsistmg in treating peroxid of sodium with boric acid in the molecularproportions of 1: 3 while the temperature is kept low, said reactionbeing carried out in the presence of water, crystallizing out theborax-containing perborate, substantially as described.

2. A borax-containing perborate having the formula FERDINAND FRITSCHE.

Witnesses ADOLF Enos, FRANZ SIMON.

